Breaking news reporter

A teenager was stabbed in the back in Sydney's west during a dispute with a young man that was sparked on Facebook, police say.

The 18-year-old man was taken to hospital in a serious condition after he was stabbed during a brawl on Mubo Crescent in Holsworthy on Tuesday night.

Inspector Mitch Newton, from Liverpool police, said the 18-year-old man and a 19-year-old man, who knew each other, were involved in a brawl on the street after an earlier disagreement on Facebook.

The dispute related to comments made on the social media site about damage to the 18-year-old's car, and comments about his mother.

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"It's a dispute between two males who are known to each other, and has been ongoing for a little while," Inspector Newton said.

"They confronted each other in the street and as a result, one of them received a stab wound to his torso."

Police said the dispute began just before 8.15pm, when the 18-year-old and two other men, including his 19-year-old alleged attacker, began arguing on Mubo Crescent, near Bena Bena Place.

Police allege the 19-year-old and his friend walked to a nearby home, where the 19-year-old armed himself with a knife and a bat and returned to the street.

A group of males had gathered on the street and police allege the 19-year-old became involved in a brawl with the group. During the brawl, the 18-year-old Chipping Norton man was stabbed in the lower back.

Police from the Liverpool local area command set up a crime scene on the street and used a police dog to track the alleged offender.

The 19-year-old Chester Hill man was arrested in nearby Kesawai Place and taken to Liverpool Police Station and charged with wounding with intent to cause grievous bodily harm, assault occasioning actual bodily harm and resisting officers in the execution of duty.

He was refused bail to appear at Campbelltown Local Court on Wednesday.

A NSW Ambulance spokeswoman said the injured man was treated for a single stab wound to his back, and was taken to Liverpool Hospital in a serious condition.

Police have appealed for anyone with information about the incident to contact Crime Stoppers on 1800 333 000.